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Check the vacuum can on the ac box. It may just be a broken vacuum line or the can can be bad. There is a baffle in there that has to move from AC to heat. Sound likes there no vac getting to the baffle vacuum can. Could also be the switch in the dash board controller. Depends on what type of car it is.
I think your problem is the head unit that selects where the air comes out ie. Face, floor, defrost, or hi-level face and floor. If that's not working then it will not let you switch location that you want the air to come out.
The baffles that direct air, heated or cooled, are controlled by vacuum 'motors.'
You may have a vacuum line off somewhere or the vacuum reservoir is cracked or one of its connectors (thin plastic protrusions) is broken.